PencilBlue is an open-source content management system (CMS) designed for creating and managing complex websites with ease. Built on Node.js, it offers robust scalability and performance, making it suitable for enterprise-level applications as well as smaller sites. PencilBlue provides a flexible plugin architecture, allowing developers to extend its functionality to meet specific needs. It supports multiple themes and includes features for easy content editing, media management, and SEO optimization. The platform is known for its modern approach to website development, leveraging JavaScript for both front-end and server-side logic.